Omron SYSMAC CS Series Operation Manual page 83

CS1-H CPU Unit Ver. 2.0 Upgrades
At this point, the gateway counter = 6 hex
FINS command
source
FINS command
Network 1
At this point, the gateway counter = 7 hex
Operating Procedure
Example:
Network 2
FINS command
FINS command
Network 3
At this point, the gateway counter = 5 hex
Set the maximum number of network levels that can be crossed by setting the
Gateway Counter Setting to 2 or 7. The gateway counter setting can be
changed in the routing table settings of the CX-Net in the CX-Programmer
Ver.4.0 or higher.
Note 1. The gateway counter is the maximum number of levels that can be
crossed, i.e., the maximum number of junctions.
With earlier CPU Units (Pre-Ver. 2.0 CPU Units), up to 3 network levels
were allowed, so the gateway counter was set to 2.
With the CPU Unit Ver. 2.0 and later CS/CJ-series CPU Units, up to 8
network levels are allowed, so the maximum gateway counter setting is 7.
2. With CS/CJ-series CPU Units Ver. 2.0 or later, communications are possi-
ble for up to 8 network levels simply by setting the normal routing tables.
No other operations are required.
3. When using communications only for up to 3 network levels, the CS/CJ-se-
ries CPU Units Ver. 2.0 or later can be used together with other CPU Units.
When using communications only for up to 4 to 8 network levels, use only
CS/CJ-series CPU Units Ver. 2.0 or later. Other CPU Units cannot be used.
(Routing error (error codes 0501 to 0504 hex) may occurs in one of the
relaying PLCs, preventing a FINS response from being returned.
4. With CS/CJ-series CPU Units with unit version 2.0 or later, the Gateway
Counter (GCT: Number of allowed bridges passed) for FINS command/
response frames is the value decremented from 07 hex (variable). (In ear-
lier versions, the value was decremented from 02 hex.)
With unit version 3.0 or later, the default GCT for FINS command/response
frames is the value decremented from 02 hex. CX-Net can be select to
used 07 hex as the value from which to decrement.
5. Do not use the Gateway Counter (GCT: Number of allowed bridge passag-
es) enclosed in the FINS header of the FINS command/response frame in
verification checks performed by user applications in host computers. The
GCT in the FINS header is used by the system, and a verification error may
occur if it is used to perform verification checks in user applications, partic-
ularly when using CS/CJ-series CPU Units with unit version 2.0 or later.
At this point, the gateway counter = 4 hex
Network 4
FINS command
At this point, the gateway counter = 0 hex
Section 1-6
FINS command
destination
FINS command
Network 8
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